Charles Daly-Remington 870 Compatibility

Hey guys I got a question, I have searched high and low for the answer online and can't find it. I recently picked up a Charles Daly Field Tactical for $189 at my local gander mountain. From what I have gathered online they are basically 870 clones. I picked up a tacstar 870 6 round side saddle and it fit with some minor modification. I also picked up a pistol grip by tacstar and it also fit but I needed to buy a new bolt and modify it slightly to get it to attach tightly. My question is, does anyone know if the threads on the magazine tube of the Charles Daly are the same as those on the 870? I would like to pick up a mag tube extension for it if the 870 one will fit. Any guesses? Thanks in advance.

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